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IDProjectCategoryView StatusDate SubmittedLast Update
0006231SOGowith SOGopublic2026-07-13 12:452026-07-13 12:45
Reportermehedi Assigned To 
PriorityhighSeveritymajorReproducibilityalways
Status newResolutionopen 
Product Version5.12.8 
Summary0006231: Conversation threading is broken: replies are displayed as separate messages instead of a single thread
Description

When using SOGo (via Mailcow), email conversation threading does not work correctly. Replies to an existing email are displayed as separate messages in the inbox rather than being grouped into a single conversation.

The expected behavior is that SOGo should group all messages belonging to the same conversation using the standard email headers (Message-ID, In-Reply-To, and References), similar to Gmail and other modern email clients.

This issue makes it difficult to follow email conversations because every reply appears as a new entry in the message list.

Steps To Reproduce

Log in to SOGo Webmail.
Receive an email from an external sender (e.g. Gmail or another mail server).
Open the email and click Reply.
Send the reply.
Continue exchanging replies between both sides.
Return to the Inbox.

Actual Result:
Each reply appears as a separate email in the inbox instead of being grouped into one conversation.

Expected Result:
All related messages should appear in a single conversation/thread.

Additional Information

Environment: Mailcow (latest stable release) with SOGo Webmail.
The issue has been observed with external email providers.
We have verified that replies are sent normally.
If required, I can provide:
Raw email headers (Message-ID, In-Reply-To, References)
Mailcow version
Browser information
Screenshots demonstrating the issue

Tagsconversation, threading, webmail

Activities

mehedi

mehedi

2026-07-13 12:45

reporter  

2026-07-12_17-14.png (127,699 bytes)   
2026-07-12_17-14.png (127,699 bytes)   

Issue History

Date Modified Username Field Change
2026-07-13 12:45 mehedi New Issue
2026-07-13 12:45 mehedi Tag Attached: conversation
2026-07-13 12:45 mehedi Tag Attached: threading
2026-07-13 12:45 mehedi Tag Attached: webmail
2026-07-13 12:45 mehedi File Added: 2026-07-12_17-14.png